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Hazard Control of NO_x in Hot Stove

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Journal of Iron and Steel Research International 2014年第3期21卷 306-311页

作者： Chuan chen Shu-sen chenG xi-bin GUO School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Xuanhua Iron and Steel Group Co. Ltd.

Hazard control of NOx is very important for the long life of hot stove shell and environmental protection. NOx concentrations during different operation periods of hot stove were calculated according to thermodynamical and dynamical analyses. The results were verified by the previously measured data. Then, the influence of hot stove oper- ation parameters on NOx concentration and the mechanism of liquid water formation in hot stove were studied. The results indicated that in gas period, the dome temperature should be controlled below 1420 ℃ in order to decrease NO~ emission. In the case of banking operation, NOx concentration was about 40--60 times higher than that in gas period. Hence, reasonable measures should be taken to reduce banking operation, especially in the situation of large excess air ratio. Since NOx formed during the whole operation process, the most effective way of preventing liquid water and HNO3 generation is to control the pipe and shell temperature, which should be higher than the condensa- tion temperature of water vapour. The condensation temperature should be considered as the design temperature of pipe and shell for hot stove.

关键词： hot stove hazard control NO~ emission liquid water formation

尿石素B对骨髓来源巨噬细胞向破骨细胞分化的调控机制

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中国组织工程研究 2025年第11期29卷 2201-2209页

作者：罗晰陈建权苏州大学苏州医学院骨科研究所江苏省苏州市215000

背景:尿石素B在机体免疫应答中起重要调节作用,具备抗炎、抗氧化和抗癌的特性,并能抑制Raw 264.7细胞向破骨细胞分化,但其对于骨髓来源的巨噬细胞向破骨细胞分化的具体作用及机制尚未阐明。系统性研究破骨细胞过度活化的调控机制,有助... 详细信息

背景:尿石素B在机体免疫应答中起重要调节作用,具备抗炎、抗氧化和抗癌的特性,并能抑制Raw 264.7细胞向破骨细胞分化,但其对于骨髓来源的巨噬细胞向破骨细胞分化的具体作用及机制尚未阐明。系统性研究破骨细胞过度活化的调控机制,有助于探索新的治疗靶点,筛选研发更安全、有效的治疗药物,为阻断破骨细胞过度活化提供新思路。目的:利用骨髓来源的巨噬细胞建立体外破骨细胞分化模型,探究尿石素B对核因子κB受体活化因子配体介导破骨细胞分化的影响,并系统性分析其作用机制。方法:(1)采用CCK-8法筛选尿石素B干预骨髓来源巨噬细胞的安全工作浓度;(2)用不同浓度(0,12.5,25,50μmol/L)尿石素B干预骨髓来源的巨噬细胞向破骨细胞分化,进行抗酒石酸酸性磷酸酶染色观察破骨细胞的数目及面积大小;(3)不同浓度(0,12.5,25,50μmol/L)尿石素B干预骨髓来源巨噬细胞的破骨分化,通过实时荧光定量PCR检测破骨特异性基因的相对表达水平;(4)蛋白印迹实验观察尿石素B对骨髓来源巨噬细胞P65、ERK信号通路的影响;(5)蛋白印迹实验检测尿石素B对骨髓来源巨噬细胞的破骨分化关键转录因子活化T细胞核因子1和c-Fos的影响。结果与结论:(1)50μmol/L及以下浓度的尿石素B对骨髓来源巨噬细胞的增殖无影响,能显著抑制骨髓来源巨噬细胞的破骨分化;(2)尿石素B主要在破骨形成前中期抑制骨髓来源巨噬细胞的破骨分化;(3)尿石素B可下调骨髓来源巨噬细胞中破骨特异性基因的相对表达水平;(4)50μmol/L的尿石素B抑制骨髓来源巨噬细胞的P65和ERK磷酸化水平,进而抑制破骨细胞形成;(5)50μmol/L的尿石素B抑制骨髓来源的巨噬细胞中破骨分化关键转录因子活化T细胞核因子1和c-Fos的表达;(6)提示尿石素B通过P65/ERK信号轴下调破骨关键转录因子活化T细胞核因子1、c-Fos的表达,抑制下游破骨特异性基因的表达,从而抑制骨髓来源的巨噬细胞向破骨细胞分化。

关键词：尿石素B P65 ERK 活化T细胞核因子1 c-Fos 骨髓来源巨噬细胞破骨细胞分化

Validation of Flight Control Law Based on LFT and Structured Singular Value

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Chinese Journal of Aeronautics 2007年第1期20卷 60-65页

作者： ZHOU xi LIU Lin chen Zong-ji DUAN Hai-bin School of Automation Science and Electrical Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

The main goal of flight clearance is to use the structured singular value （ μ ） analysis of the flight control system when some parameters in the system vary in a certain range. As the p-analysis can only be done on a linear fractional transformation （LFT） model, the first step of flight clearance is to generate the LFT model of the flight control system. In this paper, based on the introduction of basic theory of LFT and μ-analysis, an X-fighter is chosen as an example to utilize the proposed methods. In order to realize the flight clearance process automatically, a novel soRware package based on MATLAB programming language is developed. The results of simulation experiments validate the feasibility and effectiveness of the novel methods proposed in this paper.

关键词： flight clearance LFT g-analysis robust stability uncertain parameter

A Generalized Blow up Criteria with One Component of Velocity for 3D Incompressible MHD System

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Chinese Annals of Mathematics,Series B 2024年第2期45卷 253-264页

作者： bin HAN xi xiONG Department of Mathematics Hangzhou Dianzi UniversityHangzhou 310018China

In this paper,the authors study the global regularity of the 3D magnetohydrodynamics system in terms of one velocity *** particular,they establish a new Prodi-Serrin type regularity criterion in the framework of weak ... 详细信息

关键词： MHD Regularity Blow-up criterion

Maintaining moderate levels of hypochlorous acid promotes neural stem cell proliferation and differentiation in the recovery phase of stroke

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Neural Regeneration Research 2025年第3期20卷 845-857页

作者： Lin-Yan Huang Yi-De Zhang Jie chen Hai-Di Fan Wan Wang bin Wang Ju-Yun Ma Peng-Peng Li Hai-Wei Pu xin-Yian Guo Jian-Gang Shen Su-Hua Qi School of Medical Technology Xuzhou Key Laboratory of Laboratory DiagnosticsXuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Pharmacy Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina Department of Laboratory Medicine Branch Hospital of Huai’an First People’s HospitalHuai’anJiangsu ProvinceChina Department of Laboratory Medicine the Affiliated Hospital of Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Chinese Medicine The University of Hong KongHong Kong Special Administrative RegionChina

It has been shown clinically that continuous removal of ischemia/reperfusion-induced reactive oxygen species is not conducive to the recovery of late ***,previous studies have shown that excessive increases in hypochlorous acid after stroke can cause severe damage to brain *** previous studies have found that a small amount of hypochlorous acid still exists in the later stage of stroke,but its specific role and mechanism are currently *** simulate stroke in vivo,a middle cerebral artery occlusion rat model was established,with an oxygen-glucose deprivation/reoxygenation model established in vitro to mimic *** found that in the early stage(within 24 hours)of ischemic stroke,neutrophils produced a large amount of hypochlorous acid,while in the recovery phase(10 days after stroke),microglia were activated and produced a small amount of hypochlorous ***,in acute stroke in rats,hypochlorous acid production was prevented using a hypochlorous acid scavenger,taurine,or myeloperoxidase inhibitor,4-aminobenzoic acid *** results showed that high levels of hypochlorous acid(200μM)induced neuronal apoptosis after oxygen/glucose deprivation/***,in the recovery phase of the middle cerebral artery occlusion model,a moderate level of hypochlorous acid promoted the proliferation and differentiation of neural stem cells into neurons and *** suggests that hypochlorous acid plays different roles at different phases of cerebral ischemia/reperfusion *** levels of hypochlorous acid(5 and 100μM)promoted nuclear translocation ofβ-*** transfection of single-site mutation plasmids,we found that hypochlorous acid induced chlorination of theβ-catenin tyrosine 30 residue,which promoted nuclear ***,our study indicates that maintaining low levels of hypochlorous acid plays a key role in the recovery of neurological function.

关键词： cell differentiation cerebral ischemia/reperfusion injury chlorination hypochlorous acid microglia neural stem cell neurogenesis nuclear translocation stroke β-catenin

Microstructure and Mechanical Properties of RAFM-316L Dissimilar Joints by Friction Stir Welding with Different Butt Joining Modes

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Acta Metallurgica Sinica(English Letters) 2020年第1期33卷 135-146页

作者： bin He Lei Cui Dong-Po Wang Hui-Jun Li chen-xi Liu Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin 300354China

Dissimilar welded joints of reduced activation ferritic/martensitic(RAFM)steel and 316 L austenitic stainless steel were prepared by friction stir welding with different butt joining modes and welding *** weld quality of the joint was improved by placing the 316 L steel on the advancing side and the RAFM steel on the retreating side,and using a relatively high rotational speed of 400 *** microstructure of the stir zone on the 316 L steel side consisted of single-phase austenite,and the microstructure of the stir zone on the RAFM steel side mainly consisted of lath martensite and equiaxed ferrite.A mechanical mixture of the two steels and diffusion of Cr and Ni could be detected near the bonding *** of Ni from the 316 L steel to the RAFM steel resulted in the formation of a dual-phase structure consisting of austenite and *** as-welded joints showed good strength and ductility at room temperature and 550°C,which were nearly equal to those of the 316 L base *** heat-affected zone on the RAFM side had the lowest impact toughness throughout the weld with a value of 13.2 J at-40°C,~52%that of the RAFM base material.

关键词： Friction stir welding Dissimilar joint RAFM steel 316L steel Microstructures Mechanical properties

不同内固定系统治疗股骨转子间骨折的力学稳定性

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中国组织工程研究 2025年第9期29卷 1783-1788页

作者：陈曦汤涛陈铜兵李青张文常州市第一人民医院江苏省常州市213003 苏州大学附属第三医院江苏省常州市213003 苏州大学苏州医学院骨科研究所江苏省苏州市215006

背景:股骨转子间骨折的骨折类型和固定方式多样,各固定系统间的力学稳定性相差较大。使用有限元分析方法对各固定系统开展生物力学研究具有科学的临床意义。目的:通过有限元方法对比分析多种内固定应用于股骨A031-A2.1型转子间骨折的力... 详细信息

背景:股骨转子间骨折的骨折类型和固定方式多样,各固定系统间的力学稳定性相差较大。使用有限元分析方法对各固定系统开展生物力学研究具有科学的临床意义。目的:通过有限元方法对比分析多种内固定应用于股骨A031-A2.1型转子间骨折的力学稳定性。方法:在已验证有效性的股骨有限元模型基础上,对模型进行必要的切割,造模成股骨A031-A2.1型转子间骨折,模拟临床手术方法置入不同的内固定系统,分别建立股骨近端防旋髓内钉、动力髋螺钉、经皮加压钢板和股骨近端锁定钢板固定模型。约束4组模型股骨远端下所有节点,在股骨头上施加700,1400和2100N的压缩载荷,通过计算分析,观察各组模型的等效应力分布和压缩刚度,比较各组模型之间的力学稳定性。结果与结论:①通过计算分析,对比各组模型的变形量计算压缩刚度后,在各级载荷作用下,各组模型上压缩刚度呈现的趋势:生理组>股骨近端防旋髓内钉组>股骨近端锁定钢板组>经皮加压钢板组>动力髋螺钉组;完整的生理组模型的压缩刚度明显高于所有的手术组模型;②观察应力指标,因存在应力遮挡效应,致使各固定组的应力峰值均高于生理组,最大峰值均集中分布于各内固定上;其中股骨近端防旋髓内钉固定组应力峰值最小,动力髋螺钉固定组应力最高,应力分布趋势呈现:生理组<股骨近端防旋髓内钉固定组<经皮加压钢板固定组<股骨近端锁定钢板固定组<动力髋螺钉固定组;③分布于骨质模型的应力,因内固定置入位置不同呈现不同的分布结果;④提示对于股骨转子间骨折,各种内固定均能起到有效的固定,结合有限元分析结果得出股骨近端防旋髓内钉组是较好的一种内固定选择,呈现变形量小、应力峰值低,应力分布均匀的特性;经皮加压钢板组和股骨近端锁定钢板组的力学效果优良,固定效果接近股骨近端防旋髓内钉固定;动力髋螺钉固定效果欠佳,同比于其他内固定,其力学稳定性较差。

关键词：股骨转子间骨折内固定系统力学稳定性有限元分析等效应力压缩刚度

Effect of heat-source geometry on distribution and deposition of particulates in a ventilated chamber

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Particuology 2018年第1期16卷 174-184页

作者： xi chen School of Civil Engineering and Architecture Henan University of Technology Zhengzhou 450001 Henan China Key Laboratory of Heating and Air Conditioning The Education Department of Henan Province Zhengzhou 450007 Henan China

To investigate the effect of near-wall heat-source shape on particulate motion, the particulate distribu~ tion and deposition in a ventilated chamber with different heat-source configurations were numerically modeled. Using the discrete random walk model of the Lagrangian method, the trajectories of 3200 mono-disperse particulates ranging from 1 to 10 μm with a density of 1400 kg/m3 were tracked. Airflow pattern, temperature fields, the distribution of particulate concentrations, and deposition patterns are calculated and presented. The results show that the shape of a near-wall heat source has an influence on the airflow as well as the temperature field in the chamber and hence affects the particulate distribution and deposition.

关键词： Particle deposition Particle distribution Near-wall heat source Computational fluid dynamicsLagrangian method

Dynamics of coherence-induced state ordering under Markovian channels

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Frontiers of physics 2018年第5期13卷 319-325页

作者： Long-Mei Yang bin chen Shao-Ming Fei Zhi-xi Wang School of Mathematical Sciences Capital Normal University Beijing 100048 China School of Mathematical Sciences Tianjin Normal University Tianjin 300387 China

We study the dynamics of coherence-induced state ordering under incoherent channels, particularly four specific Markovian channels： amplitude damping channel, phase damping channel, depolarizing channel and bit flit channel for single-qnbit states. We show that the amplitude damping channel, phase damping channel, and depolarizing channel do not change the coherence-induced state ordering by l1 norm of coherence, relative entropy of coherence, geometric measure of coherence, and Tsallis relative α-entropies, while the bit flit channel does change for some special cases.

关键词： l1-norm of coherence relative entropy of coherence geometric measure of coherence Tsallis relative a-entropies of coherence ordering state